Measures test suite quality by introducing code mutations and identifying gaps in logic coverage.
The Mutation Test Runner skill enables Claude to evaluate the effectiveness of your test suite by performing mutation analysis. By intentionally introducing small changes—or mutations—into your source code and running existing tests against them, this skill determines whether your tests are capable of detecting logic errors. It calculates a mutation score and identifies 'surviving mutants,' providing actionable insights into where tests need strengthening to ensure high-quality, resilient software beyond simple line coverage metrics.
Key Features
01Detailed identification of surviving mutants for targeted test improvements
02Automated mutation generation including operator and logic swapping
03Real-time test suite execution against mutated code bases
04Support for targeted analysis of specific modules or critical logic paths
05884 GitHub stars
06Comprehensive mutation score calculation and reporting
Use Cases
01Identifying specific logic paths and edge cases not adequately protected by existing tests
02Improving overall project resilience by systematically reducing surviving mutants
03Validating the quality of unit tests beyond basic code coverage metrics
